Ophthalmoscope.



H. L. DB ZENG. OPHTHALMOSGOPE.

APPLICATION FILED JULYB, 1910.

Patented July 1 RIIUnn:

" and useful 01 UNITED stares; PAirEN'r caries.

HENRY L. DE ZENG, or MAPLE snaps, New JERSEY.

orzicrimmuoscorn.

To all whom it may concern: v 'Be it known that I, HENRY L. DE Zeno, a

citizen of the United States, residing at Maple Shade, in the county ofBurlington, State of New Jersey,.lia\-e invented a new hthalmoscope, ofwhich the following is a specification.

- My invention relates to a new and useful ophthalmoscope, wherein Iprovide an electric lamp and means co'ntained'within the instrument forsupplying the lamp with the necessarycurrentfor lighting it and withmeans for varying" the relative position of the reflector andla'mp; i

Figure 1 represents a vertical sectional jview of an ophthalmosco-peembodying my invention. Fig. 2 represents a rear eleva= tion of'theupper portion thereof on an enla'rged scale. Fig. 3 represents a frontelevation of the upper portion of the oplitlialmoscope. Fig. 4represents an elevation of one. of the disks in detached )ositioi'i. Fi

" 5 represents-an elevatii'in of the -other dish employed. 7

Similar nuineralsf of reference indicate corresponding parts in' theligures.

Referring to the drawings :l. have found in practice in the.ophthalmoseopes now in use, wherein it is necessary to connect the samewith a suit-ahle'sou'i'ce of rurrent'supply, that, in many-instances, itis not possible to do so by reason of the fact that the houses or otherlocalities in which the de vice is to be used, ere not supplied withelectricity, and furthermore vthe batteries heretofore employed arelarge and euinber" some and impractical toearry about from placeto'plaee. My invention is desi ned to overcome these defects and in thedraw- I have shown a construction which I- inqs haze found operatessuccessfully, but it will be evident that changes may be 'made in theconstruction, the arrangement of the peg-ts 'may'be varied and otherinstrumentalities may be employed which will come within.

Specification of Letters Patent. 'n iicati'on filed Jui' a, 1910i SerialNo. 570,938.

Pate-1i ted July 1, wire number of lenses or open rugs and ad acentwhich disk is a second plate or disk 4 which is also provided withhaving a suitable a suitable number of lenses properly inouiited thereinand with an opening free from a1 lens, itibeiug understood that the saidplate; or disks are provided with proper -notathins In thepreseutinstance, the casing? ll-lsuitably mounted. in anydesirednianneix upon a sleeve the upper end of which is provided withaeondensing lens 6 which is carried or mounted therein in any suital'ileor desired manner. The sleeve 5 is'a-da ted to receive and to slide uponthe tube TNliidll inthe present instance is in 't-hreaded engagementwith the handle 8 of the ophthalmes-cope. said handle being tubular inform and of any suitable size and diameter) Car'- ried by the tube 7 isa 'sleeve 9 one end of which is closed. as by an insulator l0 in thepresent instance. i'iite'gral with said sleeve 2' and '-\'\lll( ll isprovided.with an opening thiough which. passes anelectricaleoui'l-iu-tor ll having aheap l2 ad]a(:en t one.

end and against which cap -hears' a coil spring 13, theoppo'site end ofwhich bears against the insulator 10 in order to hold the conductor llinits extended position, it being understood that when tlie'eonductorisforced downwardly, frointhe position seen in Fig. 1 the cap '12 a'buts'the end of the sleeve 9 in order 'to limit the movement of the sa idconductor. the conductor 11 carries a contact screw 1.1-. The innerportion of the tube 7 adjacent. its outer end is threaded in'order toreceive the threaded base 15 of lamp 16 which is In the present instanceadapted to be contained. in tlie'sleeve 5, as

will be evident from Fig; 1, a closure for the opposite end of thehandle 8, which parts,'in the present instance. are in threadedengagement with eachother-, and said closure carrying a springs-rm 18,;

the free end of which'is adaptedto-be'en caged by any suitable means,such'a'sj a thumb screw 19, in threaded engagement with the closure 17,-in order that the spring armmay be forcedinwardl i 20 designates a fiberdisk carried bythe' closure 17, said disk 20 having an opening at a.suitable poi nt therein inorder to permitmovement therethrough oftheendof the spring arm 18.

21 designates a metal plate carried upon 17 designates the fiber disk2-0 and with which plate the spring arm 18 is adapted to contact whensuitably actuated therefor.

22 designates a spring seated upon the metal plate 21.

23 designates a battery adapted to be contained within and carried thehandle 8 and one pole of which battery 23 is adapted to beincont-actwith the spring 22, the other pole of the battery 23 being incontact with a pole of a battery 24 alsocontained within, and carried bythe handle 8, the opposite pole 25 of this battery being in Contact withthe contact screw 14 carried by the conductor ll.

26 designates an oblique mirror carried by the casing 2 of theophthalmoscopc and suitably situated with respect to the condensing lens6 in order to receive the rays of light therethrough and to reflect thesame to a proper point.

it will be understood that the lamp 1G is screwed into the tube 7,causing the contact point of the lamp 2 to abut the cap 12 of theconductor 11, and by reason of the resilient support for the conductor11, that is spring .13, a suitable amount of play is permitted to saidconductor 11 and whereby the lamp can be properly screwed into the tube7 to prevent injury to the parts and to maintain electrical Contact.\Vhen the; spring '{Uilf 18 is out of contact. with the metal plate 21,as seen in Fig. 1,- the circuit is open and no current is passing to thelampG, but when the thumb screw 19 is properly actuated, the end of thespring arm 18 is moved into engagement with the metal'plate 21, thusclosing the circuit which will be formed by the pole of the lampcontacting with the conductor 11, the latter with the pole 25 of thebattery 24, the oppositeepole of which battery 24 being in contact withthe pole of the battery 23, the opposite pole of said latter and thislatter is in contact with the metal )late 21, with which the spring arm18 has been forced into contact,'so that the circuit passes through theclosure 17, handle 8, tube 7 and SOCltG-tor base 15 of the lamp, whichwill accordingly be lighted and the raysof which will be directedth'rough the condensing lens Gto the mirror 26 and so properly reflected. e

5 on the tube 7, the position of the condens ing lens 6 with respect tothe lamp 16 may jection of the reflected light, governed as desired.

The arrangement and operation of the plates or disks and lenses may beaccomplished in'any desired manner.

Having thus described my invention; what I claim as new and desire tosecure by Letters Patent, is:

F In a diagnostic instrument, 'a handle adapted to carry a source ofelectric energy hers, the inner carriedby the handle and-the tric lampsupported by the said inner member of said adjustable members, and areflector and a condenser carried by said diag-.

nosticinstrument. i

r HENRY L. "DE ZENG.

lVitnesses: v 7

F; A. NEWTON, C. D. MCVAY.

battery being in contact with the spring 22 reason oft-he adjustabilityof the sleeve 7 outer supporting said instrument, an elecbe varied asmay be necessary, and the proa diagnostic instrument,' adjustable meni

